Cant log in with right info, page just refreshes - php

Question

Heres the issue, I am trying to login with the correct info (triple checked through phpmyadmin) but all it is doing is redirecting back to the login page like the info is not right.
Login Form (at the top of page)
<?php
session_start();
include "includes/class.users.php";
if(isset($_POST['login'])) {
$email = $_POST['email'];
$password = $_POST['password'];
$users->login($email, $password);
}
?>
Login Form
<form method="POST" action="" name="login">
<div id="wrappermiddle">
<h2>Login</h2>
<div id="username_input">
<div id="username_inputleft"></div>
<div id="username_inputmiddle">
<input name="email" type="text" id="myusername" placeholder="Email Address">
<img id="url_user" src="./images/mailicon.png" alt="">
</div><!--ends username_inputmiddle-->
<div id="username_inputright"></div>
</div><!--ends username_input-->
<div id="password_input">
<div id="password_inputleft"></div>
<div id="password_inputmiddle">
<input name="password" type="password" id="mypassword" placeholder="Password">
<img id="url_password" src="./images/passicon.png" alt="">
</div><!--ends password_inputmiddle-->
<div id="password_inputright"></div>
</div><!--ends password_input-->
<div id="submit">
<input type="image" src="./images/submit.png" name="login" value="Login">
</form>
class.users.php
<?php
include "class.database.php";
class Users extends Database {
public function login($email, $password) {
$stmt = $this->mysqli->prepare("SELECT email, password FROM members WHERE email = ? AND password = ? LIMIT 1");
$stmt->bind_param('ss', $email, $password);
$stmt->execute();
$stmt->bind_result($email, $password);
$stmt->store_result();
if($stmt->num_rows == 1) {
while($stmt->fetch()) {
session_start();
$_SESSION['loggedin'] = true;
header("Location: dashboard.php");
}
} else {
return false;
}
$stmt->close();
$stmt->free_result();
}
}
$users = new users();
?>
dashbord.php at the top
<?PHP
session_start();
if (isset($_SESSION['loggedin']) && $_SESSION['loggedin'] == true) {
} else {
header ("Location: index.php");
}
?>
EDIT - I tried loggin in with a bad password and I get the error - There is an error
When I login with the correct info, if just refreshes the login page.

Answer 1

I think the problem is you're setting the header after some html has been rendered.
My approach would be to include in the Login page
if ($_SESSION['loggedin] = true) {
header("Location: dashboard.php");
} else {
login page
}